Electroflotation treatment of stabilized landfill leachate using titanium-based electrode

Abstract

Landfill leachate is one of the most obstinate wastewaters to be treated due to its toxic organic and inorganic pollutants. The landfill leachate must be treated prior to discharge into a watercourse in order to preserve human health and ecosystem. Precharacterization of raw landfill leachate was done to identify the concentration of certain pollutants, in which the effluent concentration of chemical oxygen demand, ammoniacal nitrogen, and color was 1990 mg/L, 300 mg/L, and 1946 Pt-Co, respectively. The present study was conducted to treat raw landfill leachate using the electroflotation system with a designed titanium and coated titanium DSA electrodes. The experiments were conducted following the central composite design of experiments, and the design was analyzed using response surface methodology (RSM). The influence of current density, initial pH, and contact time was evaluated on the removal of COD, NH 3 -N, and color by ANOVA. It was found that current density and pH were the most effective parameters on COD and NH 3 -N removal; nevertheless, the color obtained the highest removal was up to 80%. The optimal experimental conditions were determined to be current density of 28 (A/m 2 ), initial pH 6.0, and processing time of 30 min. Under these experimental conditions, the maximum removal of COD, color, and NH 3 -H was 75%, 63%, and 83%, respectively. The findings of the present study reveal that the electroflotation technique could be utilized to treat landfill leachate as an effective pre-treatment process.

Common Issues in Aeration System Choice for Flotation Wastewater Treatment

“…When a sacrificial anode is used, the anode dissolves forming metal hydroxides, and a process of electrocoagulation takes place. Iron and aluminum anodes are the most commonly used [18,36], however, zinc, copper [37,38] and dimensionally stable anodes made of coated metals such as titanium [39][40][41] are also used. The electrodes can be placed in the flotation cell horizontally (as shown in Figure 2) or vertically.…”

Adsorptive Elimination of Heavy Metals from Aqueous Solution Using Magnetic Chitosan/Cellulose-Fe(III) Composite as a Bio-Sorbent

“…Various technologies have been implemented for eliminating heavy metals from industrial effluents. Some of these technologies include electro-flotation [ 11 , 12 ], ion exchange [ 13 ], electro-coagulation [ 14 ], coagulation–flocculation [ 15 ], precipitation [ 16 ], membrane filtration [ 17 ], and solvent extraction [ 18 ]. Although these technologies minimize the residual metal ion concentration in the treated effluent, the high operational cost, materials cost, and low heavy metal uptake efficiency have limited their application in large-scale operations [ 14 , 17 , 19 ].…”

Study of Electroflotation Beneficiation of Low-Sulphide and Refractory Gold-Bearing Raw Materials

“…The selection of electroflotation parameters such as current density and voltage, electrode material, pH values of the medium is largely determined by the field of application of this technology. For example, for removal of ammonia compounds by electroflotation purification, it is suggested to use titanium-based electrode at an optimum current density of 28 A/m 2 and an initial pH value of 6.0 [Shadi A.M.H. et al, 2021].…”